Respuesta :

LittleRedMe
The angles in a triangle add up to 180 so:

X^2 + 34 + 6x + 4 + 10x + 10 = 180

Tidy up to get a trinomial:

X^2 + 16x - 132 = 0

Solve for x.

(X + 22) (X - 6) = 0
X = -22 or X = 6

Since an angle cannot be negative, it must be X = 6.